TY - JOUR

T1 - Design and supramolecular structure of crystal associates of polyfluoroarylenediamines and 18-crown-6 (2

T2 - 1)

AU - Vaganova, Tamara A.

AU - Gatilov, Yurij V.

AU - Malykhin, Sergej E.

AU - Pishchur, Denis P.

AU - Larichev, Yurii V.

AU - Rodionov, Vladimir I.

AU - Malykhin, Evgenij V.

N1 - Publisher Copyright: © 2016 Elsevier B.V.

PY - 2017/4/5

Y1 - 2017/4/5

N2 - The possibility of co-crystallization of polyfluoroaromatic meta-diamines with 18-crown-6 in the 2:1 ratio was tested using a large group of substrates with various frameworks (benzene, naphthalene, and pyridine) and substituents (H, Cl, CF3). Co-crystals of 2:1 stoichiometry were obtained from hexafluoro-2,7-naphthylenediamine, 4-trifluoromethyltrifluoro- and 2-trifluoromethyl-4,6-difluro-1,3-phenylenediamines, 4-chlorodifluoro-2,6-diaminopyridine. According to X-ray crystallographic data, associates of CF3-containing polyfluorophenylenediamines are 2D assemblies connected via synthon Сar–N–H … Ocr. Polyfluorinated 2,7-diaminonaphthalene and 2,6-diamino-4-chloropyridine form 1D assemblies, in which the π-stacking of the naphthylenediamine molecules and the hydrogen bond Сar–N–H … Npy, respectively, are the additional structure-supporting interactions. The co-crystallization of 18-crown-6 with less electron withdrawing arylenediamines gives only associates of stoichiometry 1:1 irrespective of the components ratio and the solvent nature. To rationalize the different co-crystallization behavior of the arylenediamines, the co-crystal structures were studied using a special version of the DFT, which accounts for the van der Waals interactions. The calculated difference between the specific sublimation enthalpies for the 1:1 and 2:1 associates was suggested to be a measure of the preferable co-crystallization ratio: the both types of associates are formed when |ΔΔHsubl| is smaller than 15 J g−1, a higher value indicates a significant energy preference for one of the structures. The experimental melting enthalpy values (DSC data) for the 1:1 and 2:1 co-crystals based on the same diamine are quite similar.

AB - The possibility of co-crystallization of polyfluoroaromatic meta-diamines with 18-crown-6 in the 2:1 ratio was tested using a large group of substrates with various frameworks (benzene, naphthalene, and pyridine) and substituents (H, Cl, CF3). Co-crystals of 2:1 stoichiometry were obtained from hexafluoro-2,7-naphthylenediamine, 4-trifluoromethyltrifluoro- and 2-trifluoromethyl-4,6-difluro-1,3-phenylenediamines, 4-chlorodifluoro-2,6-diaminopyridine. According to X-ray crystallographic data, associates of CF3-containing polyfluorophenylenediamines are 2D assemblies connected via synthon Сar–N–H … Ocr. Polyfluorinated 2,7-diaminonaphthalene and 2,6-diamino-4-chloropyridine form 1D assemblies, in which the π-stacking of the naphthylenediamine molecules and the hydrogen bond Сar–N–H … Npy, respectively, are the additional structure-supporting interactions. The co-crystallization of 18-crown-6 with less electron withdrawing arylenediamines gives only associates of stoichiometry 1:1 irrespective of the components ratio and the solvent nature. To rationalize the different co-crystallization behavior of the arylenediamines, the co-crystal structures were studied using a special version of the DFT, which accounts for the van der Waals interactions. The calculated difference between the specific sublimation enthalpies for the 1:1 and 2:1 associates was suggested to be a measure of the preferable co-crystallization ratio: the both types of associates are formed when |ΔΔHsubl| is smaller than 15 J g−1, a higher value indicates a significant energy preference for one of the structures. The experimental melting enthalpy values (DSC data) for the 1:1 and 2:1 co-crystals based on the same diamine are quite similar.

KW - 18-crown-6

KW - Crystal melting enthalpy

KW - Polyfluorinated arylenediamines

KW - Supramolecular associates

KW - vdW-DFT calculations

KW - X-ray diffraction analysis

KW - COMPLEXES

KW - LIQUID-AMMONIA

KW - SOLID-STATE

KW - NEUTRAL MOLECULES

KW - HYDROGEN-BONDS

KW - 1,2-BIS(4-PYRIDYL)ETHANE

KW - ANHYDROUS AMMONIA

KW - 1D ASSEMBLIES

KW - PI-PI INTERACTIONS

KW - ARYLENEDIAMINES

UR - http://www.scopus.com/inward/record.url?scp=84999666606&partnerID=8YFLogxK

U2 - 10.1016/j.molstruc.2016.11.091

DO - 10.1016/j.molstruc.2016.11.091

M3 - Article

AN - SCOPUS:84999666606

VL - 1133

SP - 122

EP - 134

JO - Journal of Molecular Structure

JF - Journal of Molecular Structure

SN - 0022-2860

ER -